Developing a UDP server

This section shows how to develop a UDP server, which generates and returns random numbers to its clients. The code for the UDP server (udpS.go) is as follows:

package main
import (
    "fmt"
    "math/rand"
    "net"
    "os"
    "strconv"
    "strings"
    "time"
)
func random(min, max int) int {
    return rand.Intn(max-min) + min
}
func main() {
    arguments := os.Args
    if len(arguments) == 1 {
        fmt.Println("Please provide a port number!")
        return
    }
    PORT := ":" + arguments[1]

The UDP port number the server is going to listen to is provided as a command line argument.

    s, err := net.ResolveUDPAddr("udp4", PORT)
    if err != nil {
        fmt.Println(err)
        return
    }

The net.ResolveUDPAddr() function creates a UDP endpoint that the UDP server is going to listen to.

    connection, err := net.ListenUDP...